Suspended stair-scaffold



(No Model.)

J. MGDERMOTT. SUSPENDED STAIR SOAFFOLD.

No. 436,460. Patented Sept. 16, 1890.

W/ NESSES.

UNITED STATES PATENT OFFICE.

JAMES MODERMOTT, OF BROOKLYN, NEW YORK.

SUSPENDED STAlR-SCAFFOLD.

SPECIFICATION forming part of Letters Patent No. 436,460, datedSeptember 16, 1890.

Application filed May 22, 1890. Serial NO 352,786. (No model) To allwhom it may concern: 1

Be it known that 1, JAMES MODERMOTT, a citizen of the United States,residingat Brooklyn, county of Kings, State of New York, have inventedcertain new and tiseful Improvements in Suspended Stair-Scaffolds, ofwhich the following is a specification.

In the construction of buildings scaffolding must be provided forlat-hers and plasterers who are working upon the under side of thestairway. On account of the well up which the stairs come it is more orless difficult to erect scaffolding, and it is necessary to providesupports in the walls of the building as well as upon the floors. Thisalways involves more or less expense and delay in the construction ofthe scaffolding.

The object of my invention is to obviate the necessity of constructingspecial scaffolding, and I provide a suspended scaffold which issupported directly upon the treads of the stairway, all of which ishereinafter described.

In the accompanying drawings, Figure 1 is a side elevation of onesection of my improved suspended scaifold; Fig. 2, aperspective viewshowing the application of my invention to a stairway.

The suspended scaffold consists of two such. sections, such asillustrated in Fig. 1. Each section consists of an upright or standardA, having at the top a horizontal arm or support B, adjustable thereuponby means of the bolt Z) and bolt-holes b. The portion B is braced by anadjustable brace B, as is perfectly clear. The part B may also beprovided with an extensible portion B both parts being provided withbolt-holes c for the reception of bolts 0, one of which may unite thebrace B with the horizontal arm 13. The lower end of the upright A has acorresponding horizontally-projecting arm D, which may be permanentlyattached thereto. It is provided with a brace D and an extensibleportion D adjustable, as already described. This apparatus may be madeof iron of any suitable strength and character, and, as is obvious, isvery cheap and strong.

Fig. 2 shows the application of my invention to a stairway. One sectionis suspended by the supporting-arm B B and another sec tion is similarlysuspend ed on one of the treads of the stairway lower down.Scafioldingboards X are then thrown across the parts D D and a strong,simple, and perfectly safe scaffolding that may be' readily put in placeand easily removed is the result. That section of the scaffold which issuspended nearest the lower end of the stairway has the arms B and Dcloser together than the corresponding arms of the upper section, sothat the arms D on the two sections may hold the scaffold-boards in thesame horizontal plane.

I claim as my invention- 1. In a scaffolding for stairways, thecombination of an upright,a laterally-projecting supporting-arm near theupper end thereof and adapted to rest on the tread of the stairway, abrace secured to the arm extending upwardly therefrom and secured to theupright, and the lower scaffoldingsupporting arm secured to the uprightbelow the upper arm.

2. In a scaffolding for stairways, the combination of an upright,supporting-arms projecting in the same direction from the upper andlower ends thereof and disconnected from each other at their outer ends,and braces connecting the arms to the upright.

23. In a scaffolding for stairways, the combination of a pair ofuprights, arms projecting in the same direction from the upper and lowerends thereof, and scaffold-boards resting on the lower arms, the arms onone of the uprights being closer together than those on the otherupright.

4. In a scaffolding for stairways, the combination of the upright, thearms projecting in the same direction from the upper and lower ends ofthe upright, braces connecting these arms with the upright, and theextension-pieces on the outer ends of the arms.

In testimony whereof I have hereunto subscribed my name.

JAMES MoDERMOTT.

Witnesses:

JAMES F. DOYLE,- DANIEL NOLAN.

